<template>
  <div class="app-container">
    <!--表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-select v-model="searchObj.type" clearable placeholder="请选择">
          <el-option label="学员登录数统计" value="login_num"/>
          <el-option label="学员注册数统计" value="register_num"/>
          <el-option label="课程播放数统计" value="video_view_num"/>
          <el-option label="每日课程数统计" value="course_num"/>
        </el-select>
      </el-form-item>
      <el-form-item>
        <el-date-picker
          v-model="searchObj.begin"
          type="date"
          placeholder="选择开始日期"
          value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-form-item>
        <el-date-picker
          v-model="searchObj.end"
          type="date"
          placeholder="选择截止日期"
          value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-button
        :disabled="btnDisabled"
        type="primary"
        icon="el-icon-search"
        @click="showChart()">查询</el-button>
    </el-form>
    <div class="chart-container">
      <div id="chart" class="chart" style="height:500px;width:100%" />
    </div>
  </div>
</template>
<script>
  import echarts from 'echarts'
  import daily from '@/api/statistics/daily'

  export default {
      data() {
    return {
      searchObj: {
      type: '',
      begin: '',
      end: ''
    },
    btnDisabled: false,
    chart: null,
    title: '',
    xData: [],
    yData: []
  }
  },
  methods: {
    showChart() {
      this.initChartData()
      //this.setChart()
    },
    // 准备图表数据
    initChartData() {
      daily.showChart(this.searchObj).then(response => {
        // 数据
        this.yData = response.data.dataList
        // 横轴时间
        this.xData = response.data.dateList
        // 当前统计类别
        switch (this.searchObj.type) {
          case 'register_num':
            this.title = '学员注册数统计'
            break
          case 'login_num':
            this.title = '学员登录数统计'
            break
          case 'video_view_num':
            this.title = '课程播放数统计'
            break
          case 'course_num':
            this.title = '每日课程数统计'
            break
        }
        this.setChart()
      })
    },
    // 设置图标参数
    setChart() {
      // 基于准备好的dom，初始化echarts实例
      this.chart = echarts.init(document.getElementById('chart'))
      // console.log(this.chart)
      // 指定图表的配置项和数据
      var option = {
        xAxis: {
          type: 'category',
          data: this.xData//-------绑定数据
        },
      // y轴是数据轴（连续数据）
      yAxis: {
        type: 'value'
      },
      title: {
          text: this.title
      },
      tooltip: {
          trigger: 'axis'
      },
      // 系列列表。每个系列通过 type 决定自己的图表类型
      series: [{
        // 系列中的数据内容数组
        data: this.yData,//-------绑定数据
        // 折线图
        type: 'line'
      }],
        dataZoom: [{
          show: true,
          height: 30,
          xAxisIndex: [
            0
          ],
          bottom: 30,
          start: 10,
          end: 80,
          handleIcon: 'path://M306.1,413c0,2.2-1.8,4-4,4h-59.8c-2.2,0-4-1.8-4-4V200.8c0-2.2,1.8-4,4-4h59.8c2.2,0,4,1.8,4,4V413z',
          handleSize: '110%',
          handleStyle: {
            color: '#d3dee5'
          },
          textStyle: {
            color: '#fff'
          },
          borderColor: '#90979c'
      },
      {
        type: 'inside',
        show: true,
        height: 15,
        start: 1,
        end: 35
      }]
      }
      this.chart.setOption(option)
    }
  }
  }
</script>
